Hey everyone, I need some help.

I am a newbie commuter and need your help in selecting my new bike. I got an old used bike and things broke the first time i commuted 20 miles to school. So now i am looking for a new bike around $200 preferably less. I am looking for a road bike that's light and durable. I am 6 ft tall and 135 lbs. And i commute a total of 20 miles 4 days a week. What should i get? Can you send me links of the online places selling them? Thank you.